noun
miscalculation; error in calculation
Refers to a mistake in arithmetic, counting, or estimation. Slightly formal; in casual speech 計算ミス is more common.
違算があったので、もう一度計算し直した。
There was a miscalculation, so I recalculated it.
予算に違算が生じた。
A miscalculation occurred in the budget.
Compound of 違 (difference, mistake) and 算 (calculation). The exact historical derivation is uncertain, but the spelling is conventionally associated with the meaning 'miscalculation'.